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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40edd163da5d3661a5f5d40fd0bb1bca13954e3d9efeb1b4d4dbc6ddde2f9b8e' 
  AND token = '6HfSoVAzaQaVYZBgX72VlVtHpN/6sE4ih4AyyRouEBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}